WO2018045632A1

WO2018045632A1 - Method for recycling room coal pillars by solid backfilling in coordination with artificial pillars

Info

Publication number: WO2018045632A1
Application number: PCT/CN2016/106614
Authority: WO
Inventors: 张吉雄; 张强; 梅贤丞; 方坤; 韩晓乐
Original assignee: 中国矿业大学
Priority date: 2016-09-08
Filing date: 2016-11-21
Publication date: 2018-03-15
Also published as: AU2016422571B2; CA3022748C; CN106321103A; CN106321103B; RU2685357C1; US20190301283A1; CA3022748A1; AU2016422571A1; US10612378B2

Abstract

A method for recycling room coal pillars by solid backfilling in coordination with artificial pillars, comprising: conveying a solid material (3) on the ground and a cementing material (4) to a room pillar gob (9) by means of a batching mine (1) and a pipeline (2); casting a plurality of artificial pillars (6) in a coal room region at a certain distance, and performing gangue casting and backfilling on other regions of the coal room by using a gangue casting machine (8); with combined supporting of the plurality of artificial pillars and coal room fillers (7), recycling the coal pillars by using a continuous coal mining machine (10), then casting the artificial pillars in the original coal pillar region after recovering, and performing gangue casting and backfilling on the original coal pillar region by using the gangue casting machine. A system for recycling room coal pillars (5) in coordination with artificial pillars mainly comprises a material transport system, a combined supporting system, and a coal pillar recycling system. By constructing pillar grooves (11), casting artificial pillars, performing gangue casting and backfilling on a gob, and recovering the coal pillars, the recovery rate of coal resources can be increased, and the room coal pillar recovery theories and technologies in China can be enriched while promoting harmonious development of environmental protection and resource exploitation.

Description

Method for recovering room type coal pillar by solid filling and artificial pillar

Technical field

The invention relates to a method for mining coal pillars in a room type, in particular to a room type coal pillar mining method suitable for recycling coal mine pillar resources and preventing disaster caused by room-type remaining coal pillars.

Background technique

China's western mining areas have long used room-and-pillar mining, resulting in a large number of coal pillars unable to recover; only in the Yulin area of Shaanxi Province, there are 247 coal mines in the Yulin area, of which coal mines using house-column mining account for 75% of the total number of mines. A total of 201 seats. The coal mining rate of the room-column coal mining method is only 30% to 50%, and the coal volume of the housing in the Ordos area is nearly 7 billion tons, which causes great waste of national resources. On the other hand, due to the long-term load, the problem of weakening the strength of the coal pillar becomes more and more prominent, causing serious safety hazards.

At present, domestic and foreign scholars have achieved certain results in the research of room-type coal pillar recovery methods, but most of the methods have the disadvantages of low recovery rate and low degree of mechanization. In addition, the traditional backfilling method is used to replace the room-type coal pillars. The recovery cost of the column is high, and the filling and recovery process is complicated. Therefore, it is of great practical significance and broad application prospect to study a room-type coal pillar recovery method that can safely recycle indoor coal pillars, improve coal resource recovery rate and save recycling cost.

Summary of the invention

Technical Problem: The object of the present invention is to provide a simple, efficient, and high recovery rate solid filling cooperative artificial pillar recovery room type coal pillar method according to the deficiencies of the prior art.

Technical Solution: The method for recovering a house coal pillar by the solid filling collaborative artificial pillar of the present invention comprises the following steps:

a. Under the condition that the filling body cooperates with the artificial pillar to support the overburden, the continuous coal mining machine is used to recover the coal pillar, and the solid material and the cement on the ground are first transported to the pillar through the feeding well and the conveying pipeline. Gob area

b. pouring a plurality of artificial ore columns at intervals between the room-type mined-out areas in the room-type coal pillars, filling the plurality of artificial pillars that have been poured, and tamping to form a coal house filling body;

c. Under the condition of jointing multiple artificial pillars and coal house fillings, use the continuous mining machine to recover the house coal pillars in the joint support area until the whole recovery of all house coal pillars is completed. .

The mining process of the room type coal pillar includes the following steps:

a. Firstly, a square column groove with a side length of 4 m is constructed at a distance between the pillar-type goafs on the side of the house-type coal pillars, and a baffle wall is installed in the constructed square column trough, and the baffle walls must be tightly closed. And in full close contact with the top plate;

b. Grouting and constructing an artificial pillar in the constructed square column trough. When the height of the slurry of the artificial pillar is 50 mm below the top plate, the concentration of the slurry is increased, and the artificial column is topped and filled;

c. After the artificial pillar is poured, the throwing and boring machine is used to carry out the throwing and filling of the room-type goaf, and the bulldozer is used for tamping and strengthening;

d. Repeat steps a to c to complete the filling of the room-side goaf on the other side of the room coal pillar;

e. After the strength of the artificial pillar and the coal house filling body reaches the original rock stress, the recovery of the room type coal pillar is carried out by means of horizontal recovery by means of continuous mining machine, and the order of recovery is shuttled in a “ten” shape;

f. The artificial coal pillar is poured first in the room type coal pillar area after the mining, and then the throwing machine is used to carry out the throwing and filling of the room type coal pillar area, and the “front coal mining and rear filling” are simultaneously realized on the working surface.

The plurality of artificial pillars to be poured have a separation distance of 15-17 m and an optimum distance of 16 m.

Advantageous Effects: Due to the adoption of the above technical solutions, the present invention can realize safe and efficient recovery of the residual coal pillar resources of the house, and economic and engineering research is of great significance. It is especially suitable for room-type coal pillar resource recovery and prevention of house-type coal pillar mining caused by house-type residual coal pillars. Compared with the prior art, it is the basis for ensuring safe recovery of house-type remaining coal pillars and high coal resource recovery rate. It has significantly reduced the capital investment in the recovery of the column, simplified the filling and recovery process, and opened up a new solution for the recovery of the remaining coal pillars under the similar conditions in China. It can not only improve the recovery rate of coal resources, but also Promoting the coordinated development of environmental protection and resource exploitation, while enriching the theory and technology of mining coal pillars in China, science and engineering are of great significance. The method is simple, convenient to operate, and has wide practicality in the technical field.

DRAWINGS

1 is a technical schematic diagram of a solid-filled collaborative artificial pillar recovery room type coal pillar method of the present invention;

2(a) is a top plan view of an artificial pillar arrangement of the method for recovering a coal pillar of a solid-filled collaborative ore column according to the present invention;

2(b) is a cross-sectional view showing an artificial pillar arrangement of the method for recovering a coal pillar of a solid filling synergistic artificial pillar according to the present invention;

3(a) is a plan view showing a reinforced filling state of the solid-filled collaborative artificial pillar recovery room type coal pillar method of the present invention;

Figure 3 (b) is a cross-sectional view showing the state of reinforcement filling of the method for recovering a room type coal column of the solid filling synergistic artificial pillar according to the present invention;

4(a) is a plan view showing the recovery filling state of the solid-filled collaborative artificial pillar recovery room type coal pillar method of the present invention;

Fig. 4 (b) is a cross-sectional view showing the recovery filling state of the solid-filled collaborative artificial pillar recovery room type coal pillar method of the present invention.

In the picture: 1-feeding well, 2-conveying pipeline, 3-solid material, 4-binder, 5-room coal pillar, 6-artificial pillar, 7-coal filling body, 8-throwing machine, 9 - Room-type goaf, 10-linker, 11-column, 12-top.

detailed description

The embodiments of the present invention are further described below with reference to the accompanying drawings:

The method for recovering a room type coal pillar by the solid filling collaborative artificial pillar of the invention comprises the following steps:

a. Under the condition that the filling body cooperates with the artificial pillar to support the overburden, the continuous coal mining machine adopts the method of mining the coal pillar 5, firstly, the solid material 3 on the ground is passed through the feeding well 1 and the conveying pipeline 2 The cement 4 is transported to the room-type goaf 9;

b. Casting a plurality of artificial pillars 6 at a distance between the room-type goafs 9 between the house-type coal pillars 5, and using a throwing machine 8 pairs of pillars and columns between the plurality of artificial pillars 6 that are poured The empty area is filled and thrown, and the bulldozer is used for 夯 Solid reinforcement, constitutes a coal house filling body 7; the plurality of artificial columns 6 of the pouring are separated by a distance of 15-17 m, and the optimal distance is 16 m;

c. Under the condition that the plurality of artificial pillars 6 and the coal house filling body 7 are jointly supported, the continuous coal mining machine 10 is used for recycling each room type coal pillar 5 in the joint supporting area, and then after the mining. The artificial coal pillars 6 are poured in the original coal pillar area, and the original coal pillar area is thrown and filled by a throwing machine until the overall recovery of all the house coal pillars is completed. Solid filling combined with artificial pillar recovery room type coal pillar system mainly includes material conveying system, combined support system and coal column recovery system;

The mining process of a single room coal pillar includes the following steps:

a. Firstly, a square column groove 11 with a side length of 4 m is constructed at a distance from the room-type goaf 9 on the side of the house coal pillar 5 for installing the baffle wall and performing manual pouring, in the constructed square column groove The baffle wall is installed in the 11th, and the baffle walls are required to be tightly closed and completely in close contact with the top plate 12;

b. Grouting and constructing an artificial pillar 6 into the constructed square column trough 11 and pouring the artificial pillar 6 to prevent the unevenness of the upper and lower strength of the artificial pillar 6 due to the segregation of the primary slurry, and pouring the bottom The order of the top is divided into multiple times. When the height of the slurry for pouring the artificial pillar 6 reaches 50 mm below the top plate 12, the concentration of the slurry is increased, and the artificial pillar 6 is topped and filled;

c. After the artificial pillar 6 is poured, the throwing machine 8 is used for the throwing and filling of the room-type goaf, and the bulldozer is used for tamping reinforcement;

d. Repeat steps a to c to complete the filling of the other side pillar-type goaf 9 of the house coal pillar 5;

e. After the strength of the artificial pillar 6 and the coal house filling body 7 reaches the original rock stress, the recovery of the room type coal pillar 5 is carried out by means of the horizontal recovery method by the continuous mining machine 10, and the order of the recovery is a "ten" word shuttle shape. ;

f. In the area of the coal pillar 5 after the mining, the artificial pillar 6 is poured first, and then the throwing machine 8 is used to carry out the dumping and filling of the area of the coal pillar 5, and at the same time, the front coal mining and the rear filling are realized at the working surface. ".

Claims

The invention relates to a solid filling cooperative artificial pillar recycling room type coal pillar method, which comprises the following steps:

a. Under the condition that the filling body cooperates with the artificial pillar to support the overburden, the continuous coal mining machine is used to recover the coal pillar (5), firstly through the feeding well (1) and the conveying pipeline (2). The solid material (3) and the binder (4) are transported to the room-type goaf (9);

b. Casting a plurality of artificial pillars (6) at intervals in the room-type goaf (9) between the house-type coal pillars (5), and filling between the plurality of artificial pillars (6) that are poured, And tamping and strengthening to form a coal house filling body (7);

c. Under the condition of multiple pouring artificial pillars (6) and coal house fillings (7), use the continuous mining machine (10) to jointly support the coal pillars in the supporting area (5) Recycling is carried out until the overall recovery of all room coal pillars is completed.
The method for recovering a coal pillar according to claim 1 , wherein the single-chamber coal pillar recovery process comprises the following steps:

a. First, construct a square column groove (11) with a side length of 4 m in the room-type goaf (9) on the side of the house coal pillar (5), and install it in the constructed square column groove (11). The baffle wall requires that the baffle walls must be tightly closed and in full close contact with the top plate (12);

b. Grouting artificial pillars (6) into the constructed square column trough (11), and increasing the slurry concentration when the height of the slurry of the artificial pillar (6) is 50 mm below the top plate (12) The pillar (6) is topped for filling;

c. After the artificial pillar (6) is poured, use the throwing machine (8) to carry out the throwing and filling of the room-type goaf (9), and use the bulldozer to carry out the tamping reinforcement;

d. Repeat steps a to c to complete the filling of the other side room-type goaf (9) of the house coal pillar (5);

e. After the strength of the artificial pillar (6) and the coal house filling body (7) reaches the original rock stress, the recovery of the coal pillar (5) by the horizontal recovery method is carried out by means of the continuous mining machine (10). The order is "ten" in the shape of a shuttle;

f. In the area of the coal pillar (5) after the mining, the artificial pillar (6) is poured first, and then the throwing machine (8) is used to carry out the throwing and filling of the room type coal pillar (5). Realize "mining coal in front, filling in the back".
The method for recovering a coal pillar according to claim 2, wherein the plurality of artificial pillars (6) are separated by a distance of 15-17 m and an optimum distance of 16 m.